Remove an unused variable.
Remove an unused variable.

* subversion/libsvn_wc/diff_local.c
  (diff_status_callback): drop unused 'do_diff'

git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@1446865 13f79535-47bb-0310-9956-ffa450edef68

YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion